The is a homebrew tool for Nintendo 3DS consoles, typically used to update the Luma3DS custom firmware directly on the device. While users often seek a QR code for "remote installation" via the FBI app , this method has become less reliable due to technical changes in GitHub's file hosting. Recommended Installation Methods
A word of caution before you scan any QR code. The 3DS homebrew community is generally trustworthy, but malicious QR codes exist that could attempt to install brickware or data-wiping scripts. luma updater 2.6 qr code
(scan with any phone reader to see):